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Method for improving dispersivity of zeolite and reducing average particle size of zeolite

A dispersive, zeolite technology, applied in the direction of crystalline aluminosilicate zeolite, can solve the problems of application limitations and operational complexity, and achieve the effects of simple operation, low environmental pollution and simple equipment

Active Publication Date: 2012-05-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the research on zeolite dispersion is carried out for its specific application in a certain field (US Patent 6,533,855 and US Patent 5,800,603), so it has certain application limitations and operational complexity

Method used

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  • Method for improving dispersivity of zeolite and reducing average particle size of zeolite
  • Method for improving dispersivity of zeolite and reducing average particle size of zeolite
  • Method for improving dispersivity of zeolite and reducing average particle size of zeolite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 10g of Na-type zeolite 1 into 100ml of deionized water, disperse for 15min with ultrasonic waves with a power of 100W and a frequency of 40kHz under stirring, then add 8g of NaOH, heat the solution to 50°C under ultrasonic dispersion, and keep it for 60min, then The slurry was vacuum-filtered and washed with deionized water to a neutral pH of 7.0. The filter cake was placed in an oven and dried at 120° C. for 4 hours to obtain sample A-1.

Embodiment 2

[0029] Add 10g of K-type zeolite 1 into 100ml of deionized water, disperse for 15min with ultrasonic waves with a power of 600W and a frequency of 20kHz under stirring, then add 11.2g of KOH, heat the solution to 50°C under ultrasonic dispersion, and keep it for 30min. Then the slurry was vacuum filtered and washed with deionized water until the pH value was 7.0 neutral. The filter cake was placed in an oven and dried at 120° C. for 4 hours to obtain sample A-2.

Embodiment 3

[0033] Add 40g of zeolite 2 into 100ml of deionized water, disperse for 15min with ultrasonic waves with a power of 100W and a frequency of 40kHz under stirring, and then add 42.4g of Na 2 CO 3 , the solution was heated to 80°C under ultrasonic dispersion, and kept for 60min, then the slurry was vacuum-filtered, and washed with deionized water to a pH value of 7.0, and the filter cake was placed in an oven and dried at 120°C for 4h, Sample B-1 was obtained.

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Abstract

The invention provides a method for improving the dispersivity of zeolite and reducing the average particle size of the zeolite, which comprises the following steps: adding the zeolite into alkali liquor, further dispersing under the condition of ultrasonic waves, carrying out suction filtration on slurry, and then washing and drying, wherein the dispersion condition in the alkali liquor is that the concentration of the alkali liquor is 0.1-6 mol / l, and the dispersion conditions under the ultrasonic waves are that the power range is 50W-600W, the frequency range is 20-40kHz, the total dispersion time is 10-240min, and the dispersion temperature is 30-80 DEG C. The method can effectively reduce the degree of polymerization of zeolite aggregates on the basis of keeping the degree of crystallinity of the zeolite, and further reduce the particle size of zeolite particles; furthermore, the method has the advantages of simple required equipment, simple and high-efficient operation, no introduction of impurities during the processing process and small environmental pollution.

Description

technical field [0001] The invention relates to a method for depolymerizing zeolite aggregates by using ultrasonic cavitation under mild conditions, simultaneously using alkali solution to dissolve amorphous components bonded between molecular sieve particles, and etching the surface of zeolite by alkali , an air film is formed between the zeolite particles, which unravels the large zeolite aggregates. The method effectively prevents the re-agglomeration of the zeolite particles, and obviously reduces the zeolite particle size while maintaining the zeolite crystal structure. Background technique [0002] Zeolites have been widely used as catalysts and catalyst supports because of their special pore structure. Because the small-grain zeolite has a larger external area, the pores are shorter, and when used as a catalyst or carrier in many reactions, both the catalytic performance and the life of the catalyst are greatly improved (B.Vogel et al.Cata.Lett .2002, 79, 107-112). ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02
Inventor 张忠东刘双喜高雄厚汪毅王振宇刘涛刘超伟田爱珍陆通马建刚
Owner PETROCHINA CO LTD